Obe an effective solvent in living systems, a substance must be able to meet all but one of the following requirements, namely a) remains liquid over a wide temperature range. b) does not readily combine with lipid molecules. c) able to dissolve a great variety of chemical compounds. d) provide a safety against extremes in temperature by having a high heat capacity.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

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